Gauge



April 8, 1924. 1,489,576

B. M. w, HANSON GAUGE Filed April 16 1921 gnoenl'o p.

24 al'tozneg Patented Apr. 8, 1924.

' UNITED STATES I 1,489,576 PATENT ornca.

Bauer 1:. w. Hanson, or marrow), cou'n'ncrrcu'r.

cauen' Application filed April 16, 1921. Serial 170481957.

To all whom it may concern:

Be it known that I, Bauer M. W. Hanson, a citizen of the United States, and a resident of Hartford, in the county of Hartford, State of Connecticut, have invented certain new and useful Improvements in Gauges, of which the followmg is a specification.

This invention relates to gauges and has peculiar application in gauges for screw Fig. 1 is a side view of a gau e constructed in accordance with one embo iment of the invention.

Fig. 2 is a forward end view thereof, looking indirection of the arrow. 2 of Fig. 1 and with parts broken away.

Figs. 3 and 4 are views similar to Figs. 1

and 2, respectively, but illustrate another embodiment of my invention. v

Referringto that embodiment of the invention shown in Fi 1 and 2, a is a frame. in the form of a Cli aving a pair of heads 9, 10 on the opposed surfaces of which. are mounted jaws b, c. The jaw 12 com rises a pair of sections 5 aced one back of t e other and each section aving an active face in the form of a segment of a screw similar in all respects .totlie' thread to be gauged except that if the auge is constructed to gauge right hand s rew threads, the sections b have serrations or teeth 11 comprising segments of a left hand screw thread. These sections are secured to the head 9 by bolts 12. The jaw c is provided with a plurality of serrations 13, each similar in transverse section to the groove of the thread to be gauged except that the serrations may not be as deep as the groove. These serrations are inclined to the length of the jaw c in accordance with the angle of lead of the thread to be gauged,

so that the serrations and the portions of the threaded member in engagement therewith extend in the same directlon. The jaw member 0 is secured to the head 10 by a bolt 15, there being sufficient play between.

theparts to allow of angular adjustment of the member a. Positioned within an inchanges in working allowances.

clined groove 16 in the head '10 and extending transversely of the jaw member 0 is a wedge 17.

longitudinally adjuste by a screw 18 to change the inclination of the jaw 0 relative to the jaw b. The member 0, adjacent its rear end, is supported by an adjustable screw 19. The gauge shown in Figs. 1 and 2 is ad-- justedand used in the following manner. Assuming for purposes of illustration that the guage is particularl constructed for measuring threaded mem rs approximate- I 1y 1" in diameter and the specified limits of accuracy for the particular threaded member to be gauged are 1'. and l" minus .002, the jaw "c is adjusted by means of the wedge 17 and the screw 19 until a threaded test piece havin a diameter of exactly .998" will just fall to pass between the rear This wed e is adapted to be section b and the jaw c, and a second test piece of exactlyl in. diameter will just slide past the forward section of the jaw b. The taper of the jaws relative to one another between the sections b, b will now be equal to the working allowance, namely .002. The threaded member to be gau ed is now inserted between the jaws, and i it can be moved past the high point of the forward section b and not past the high point of the'rear section b, it is within the limits of tolerance. By holding the gauge between a source of light and the eye and sighting along the serrations or teeth, it can be readily determined whether each of the convolutions of the thread is accurate as to size and shape and also any errors in the pitch of the thread will be made apparent. It is evident that by adjusting the wedge 17 and the screw 19 wear between the jaw faces may be readily taken up and the inclination of' these faces relative to oneanother may be varied in accordance with For con-- the head 10 of the gauge is awedge 17',

and thesewedges are adapted to be adv the distance between this section and the.

justed by the respective screws 19'. From Fig. 4 it faces of he grooves 16' in which the wedges are mounted are inclined and the wedges are longitudinally slotted as at 20 to accommodate the securing bolts 15'. It is, of course, understood that the forward section of the jaw 0' will be adjustable by means of its wedge 17 so that the distance between the forward section 0 and b is equal to the maximum limit of accuracy s ecified for the member to be gauged, and the rear section a will-be adjusted so that rear section b will be equal to the specified minimum limit of accuracy.

It is, of course, obvious that my invention is susceptible of various modifications and changes which are within the spirit of the invention without departing from the scope of the following claims it being understood that the present disclosure of my invention is by way of illustration only and it is not to be taken as restrictive of my conception.

I claim as my invention 1. A gauge provided with a pair of opposed jaws, one of which comprises .a plu-- rality of sections spaced one 'behind the other and each section having serrations complementary to the thread to be gauged.

2. A gauge rovided with a pair of opposed jaws eac provided with a plurality of serrations,,one of said jaws com risin a plurality of sections spaced one behin the other, and means 'for adjusting said jaws relatively to one another to relatively change the angle between the active plane will be seen that the bottom sur- 'posedjaws one of sections spaced apart long tudinally of of said sections and the active plane of the other jaw.

3. A gauge provided with a pair of opposed jaws each provided with a plurality of serrations, one of said jaws com risin a plurality of sections spaced one ehin the other, and means for adjusting each of said sections relative to the other jaw.

4. A gauge rovided with a pair ofopposed jaws eac of which comprises a pair of sections, each section having serrations complementary to the thread to be guaged, and means for adjusting some of said sections relative to the o posing ones.

5. A gauge provide with a pair of opposed jaws having teeth corresponding to the threads of the member to be gauged, each of which comprises a pair of sections spaced apart longitudinally of the other jaw, and means for adjusting said jaws relative to one another.

6. A gauge provided with a pair of opposed jaws eac having teeth correspondin to the threads of the member to be gaug one or which jaws comprises a pair of sections spaced apart longitudinally or the other jaw, and wedge means for adjusting each of said sections relative to the other aw. J 7. A gauge provided with a pair of opof' which comprises a pair the other jaw, each section having an active face in the form of a segment of a screw similar to the thread to be gauged with the teeth of theserrations running in a direction opposite to those of the thread.

BENGT M. W. HANSON. 

